MR2 - Celica GT4

[Barney]

I am right in my understanding that the engines are the same in the post 1994 MR2 turbo and the Celica GT4 ??

[stevecordiner]

The post oct/now 1993 (rev 3 MR2) has the same engine as what is found in the ST205 celica GT4.

The 1991-1993 MR2 turbo has the same engine as whats in the equivilent generation celica GT4

[ethan]

not exactly the same apparantly the gt4 has diff part number for:
turbo charger
engine ECU (obviously, although the connector pin-out is almost identical. Probably the same PCB programmed with different software and with perhaps some components left unpopulated).
complete engine assembly (ST205 is 19000-88508, MR2 is 19000-88509)
head sub assembly
short block assembly
intercooler (obviously!)

[Rogue]

engine ECU (obviously, although the connector pin-out is almost identical. Probably the same PCB programmed with different software and with perhaps some components left unpopulated).

The difference in the ECU is to allow for the chargecooler on the GT4., other than that they are identical. A Celica ECU will run an MR2, but will only work in safe mode unless something is done to trick it into thinking there's a chargecooler!

Rogue

[craig]

engine ECU (obviously, although the connector pin-out is almost identical. Probably the same PCB programmed with different software and with perhaps some components left unpopulated).

The difference in the ECU is to allow for the chargecooler on the GT4., other than that they are identical. A Celica ECU will run an MR2, but will only work in safe mode unless something is done to trick it into thinking there's a chargecooler!

Rogue

Why did Toyota never fit a chargecooler to the MR2?

[JJ]

not exactly the same apparantly the gt4 has diff part number for:
turbo charger
engine ECU (obviously, although the connector pin-out is almost identical. Probably the same PCB programmed with different software and with perhaps some components left unpopulated).
complete engine assembly (ST205 is 19000-88508, MR2 is 19000-88509)
head sub assembly
short block assembly
intercooler (obviously!)

The engines are basically the same, the differences are usually due to steel type turbines fitted to the CT-26's - UK spec ones, theres EGR valves clagged onto the intake, the ecu runs a different program ( less agressive ignition ) due to the fuel differences - cam covers are difference between different revs .. kinda hard to keep up with all the differences, but as far as the hard core block goes, its the same unit - barr the ancillaries.... which either has been fitted to suit the car ( engine position ) or suit the ancillaries that surround it.